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  <meta name="description" content="简介　　这里按照Mina官方示例给出的代码，实现了一个打印服务端日期的示例，客户端直接在用telnet进行连接。我们先看服务端和客户端相关类的UML图：
　　
服务端实现　　一个基本的nio服务需要包括：监听指定的端口，对收到的消息进行解码，对解码后的消息进行业务处理等功能。同时也可以设置tcp的noDelay参数，空闲连接等。按照这几点，我们看看下面的实现代码！　　本示例的服务端在收到客户端的消">
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<meta property="og:description" content="简介　　这里按照Mina官方示例给出的代码，实现了一个打印服务端日期的示例，客户端直接在用telnet进行连接。我们先看服务端和客户端相关类的UML图：
　　
服务端实现　　一个基本的nio服务需要包括：监听指定的端口，对收到的消息进行解码，对解码后的消息进行业务处理等功能。同时也可以设置tcp的noDelay参数，空闲连接等。按照这几点，我们看看下面的实现代码！　　本示例的服务端在收到客户端的消">
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<meta name="twitter:description" content="简介　　这里按照Mina官方示例给出的代码，实现了一个打印服务端日期的示例，客户端直接在用telnet进行连接。我们先看服务端和客户端相关类的UML图：
　　
服务端实现　　一个基本的nio服务需要包括：监听指定的端口，对收到的消息进行解码，对解码后的消息进行业务处理等功能。同时也可以设置tcp的noDelay参数，空闲连接等。按照这几点，我们看看下面的实现代码！　　本示例的服务端在收到客户端的消">
  
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        <section id="main"><article id="post-nio/16.Mina系列二之示例" class="article article-type-post" itemscope itemprop="blogPost">
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      Mina系列二之示例
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        <h2 id="u7B80_u4ECB"><a href="#u7B80_u4ECB" class="headerlink" title="简介"></a>简介</h2><p>　　这里按照Mina官方示例给出的代码，实现了一个打印服务端日期的示例，客户端直接在用telnet进行连接。我们先看服务端和客户端相关类的UML图：<img src="/images/mina-uml-server.jpg" alt="服务端UML"><img src="/images/mina-uml-client.jpg" alt="客户端UML">
　　</p>
<h2 id="u670D_u52A1_u7AEF_u5B9E_u73B0"><a href="#u670D_u52A1_u7AEF_u5B9E_u73B0" class="headerlink" title="服务端实现"></a>服务端实现</h2><p>　　一个基本的nio服务需要包括：监听指定的端口，对收到的消息进行解码，对解码后的消息进行业务处理等功能。同时也可以设置tcp的noDelay参数，空闲连接等。按照这几点，我们看看下面的实现代码！<br>　　本示例的服务端在收到客户端的消息后，会向客户端写入当前日期信息，同时监听读写空闲！<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MinaTimeServer</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> PORT = <span class="number">9123</span>;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">( String[] args )</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">        NioSocketAcceptor acceptor = <span class="keyword">new</span> NioSocketAcceptor();</span><br><span class="line"></span><br><span class="line">        acceptor.getFilterChain().addLast( <span class="string">"logger"</span>, <span class="keyword">new</span> LoggingFilter() );</span><br><span class="line">        acceptor.getFilterChain().addLast( <span class="string">"codec"</span>, <span class="keyword">new</span> ProtocolCodecFilter( <span class="keyword">new</span> TextLineCodecFactory( Charset.forName(<span class="string">"UTF-8"</span>))));</span><br><span class="line"></span><br><span class="line">        acceptor.setHandler(<span class="keyword">new</span> TimeServerHandler());</span><br><span class="line"></span><br><span class="line">        acceptor.getSessionConfig().setReadBufferSize( <span class="number">2048</span> );</span><br><span class="line">        acceptor.getSessionConfig().setIdleTime( IdleStatus.BOTH_IDLE, <span class="number">10</span> );</span><br><span class="line">        <span class="comment">//SocketSessionConfig继承自IoSessionConfig</span></span><br><span class="line">        acceptor.getSessionConfig().setTcpNoDelay(<span class="keyword">true</span>);</span><br><span class="line"></span><br><span class="line">        acceptor.bind(<span class="keyword">new</span> InetSocketAddress(PORT));</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">TimeServerHandler</span> <span class="keyword">extends</span> <span class="title">IoHandlerAdapter</span> </span>&#123;</span><br><span class="line">        <span class="annotation">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">exceptionCaught</span><span class="params">( IoSession session, Throwable cause )</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">            cause.printStackTrace();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="annotation">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">messageReceived</span><span class="params">( IoSession session, Object message )</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">            String str = message.toString();</span><br><span class="line">            <span class="keyword">if</span>( str.trim().equalsIgnoreCase(<span class="string">"quit"</span>) ) &#123;</span><br><span class="line">                session.close(<span class="keyword">true</span>);</span><br><span class="line">                <span class="keyword">return</span>;</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            Date date = <span class="keyword">new</span> Date();</span><br><span class="line">            session.write( date.toString() );</span><br><span class="line">            System.out.println(<span class="string">"Message written..."</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="annotation">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">sessionIdle</span><span class="params">( IoSession session, IdleStatus status )</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">            System.out.println( <span class="string">"IDLE "</span> + session.getIdleCount( status ));</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<h2 id="u5BA2_u6237_u7AEF_u8FDE_u63A5"><a href="#u5BA2_u6237_u7AEF_u8FDE_u63A5" class="headerlink" title="客户端连接"></a>客户端连接</h2><p>　　直接采用telnet客户端进行连接,发送数据即可看到结果！这里我们采用Mina实现一个客户端的的方式。该客户端在与服务端连接后，向服务端发送一条数据，并打印收到的消息！<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MinaTimeClient</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> PORT = <span class="number">9123</span>;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">( String[] args )</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">        NioSocketConnector acceptor = <span class="keyword">new</span> NioSocketConnector();</span><br><span class="line"></span><br><span class="line">        acceptor.getFilterChain().addLast( <span class="string">"logger"</span>, <span class="keyword">new</span> LoggingFilter() );</span><br><span class="line">        acceptor.getFilterChain().addLast( <span class="string">"codec"</span>, <span class="keyword">new</span> ProtocolCodecFilter( <span class="keyword">new</span> TextLineCodecFactory( Charset.forName(<span class="string">"UTF-8"</span>))));</span><br><span class="line"></span><br><span class="line">        acceptor.setHandler(<span class="keyword">new</span> TimeServerHandler());</span><br><span class="line"></span><br><span class="line">        acceptor.getSessionConfig().setReadBufferSize( <span class="number">2048</span> );</span><br><span class="line">        acceptor.getSessionConfig().setIdleTime( IdleStatus.BOTH_IDLE, <span class="number">10</span> );</span><br><span class="line">        <span class="comment">//SocketSessionConfig继承自IoSessionConfig</span></span><br><span class="line">        acceptor.getSessionConfig().setTcpNoDelay(<span class="keyword">true</span>);</span><br><span class="line"></span><br><span class="line">        acceptor.connect(<span class="keyword">new</span> InetSocketAddress(PORT));</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">TimeServerHandler</span> <span class="keyword">extends</span> <span class="title">IoHandlerAdapter</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="annotation">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">sessionOpened</span><span class="params">(IoSession session)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">            <span class="comment">// Empty handler</span></span><br><span class="line">            session.write(<span class="string">"hello"</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="annotation">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">exceptionCaught</span><span class="params">( IoSession session, Throwable cause )</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">            cause.printStackTrace();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="annotation">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">messageReceived</span><span class="params">( IoSession session, Object message )</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">            String str = message.toString();</span><br><span class="line">            System.out.println(str);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="annotation">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">sessionIdle</span><span class="params">( IoSession session, IdleStatus status )</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">            System.out.println( <span class="string">"IDLE "</span> + session.getIdleCount( status ));</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<h2 id="u603B_u7ED3"><a href="#u603B_u7ED3" class="headerlink" title="总结"></a>总结</h2><p>　　从开篇的uml图中可以看到，Mina抽象出了IoAcceptor和IoConnector的概念，它们同属于IoService。同时实现了过滤器链，实现消息的编解码等操作。通过IoHandler实现对各种IO事件，比如：连接、异常、收发消息和空闲等的处理。后续系列文章我们将逐一解答这些功能的实现原理！</p>
<h2 id="u53C2_u8003_u94FE_u63A5"><a href="#u53C2_u8003_u94FE_u63A5" class="headerlink" title="参考链接"></a>参考链接</h2><p><a href="http://mina.apache.org/mina-project/quick-start-guide.html" target="_blank" rel="external">http://mina.apache.org/mina-project/quick-start-guide.html</a></p>

      
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